EP1410521A1 - Verfahren und anordnung zur mehrstufigen parallelen interferenzunterdrückung in einem cdma-system - Google Patents
Verfahren und anordnung zur mehrstufigen parallelen interferenzunterdrückung in einem cdma-systemInfo
- Publication number
- EP1410521A1 EP1410521A1 EP01944948A EP01944948A EP1410521A1 EP 1410521 A1 EP1410521 A1 EP 1410521A1 EP 01944948 A EP01944948 A EP 01944948A EP 01944948 A EP01944948 A EP 01944948A EP 1410521 A1 EP1410521 A1 EP 1410521A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stage
- interference
- symbol
- pic
- carried out
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
- H04B1/7107—Subtractive interference cancellation
- H04B1/71075—Parallel interference cancellation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70707—Efficiency-related aspects
Definitions
- the invention relates to a driving method for receiving CDMA signals according to the preamble of claim 1.
- the invention further relates to an arrangement according to the preamble of claim 12.
- CDMA Code Division Multiple Access
- This is a spread spectrum technique in which each of the l..k..K users is assigned a specific spreading code.
- BAKE receiver which is a suitable receiver for spread spectrum systems with one user, as described in Proakis, J .: “Digital Communications", McGraw-Hill, 3 rd ed., 1995, is CDMA systems with several for spread spectrum Users are often not suitable in the case of multipath propagation and / or non-orthogonal spreading sequences, since the bit error rate is greatly increased by the influence of the cross-correlations between the individual users and a certain measure of quality with regard to the bit error rate can be exceeded, see also Nerdu, S .: “Multiuser Detection ", Cambridge University Press, l st ed., 1998.
- CDMA inherent multiple access interference (MAI , Multiple access interference) is not taken into account and therefore ch are not suppressed.
- the object of the invention is to provide a solution for a multi-stage parallel interference reduction which has less complexity than the multiple of a single-stage parallel interference reduction.
- stage (i-2) is connected to the output of stage (i-1) by a subtractor, and the output of the subtractor is connected to the input of stage (i) , and the output signal of stage (i-1) is added to the output signal of stage (i) and the total interference formed in stage (i-1) is used as the input reception signal of stage (i).
- Fig. 1 shows a multi-level PIC receiver in block diagram.
- Fig. 2 shows an example of a level of a CDMA receiver using the PIC method.
- Fig. 3 shows a calculation for symbols that are only included in the interference calculation in level 2 if the difference between the respective symbols of the previous one
- FIG. 5 is an example of an arrangement of a modified multi-stage PIC in which the spreading and channel simulation only is activated if the amount of the symbol difference of the two previous stages is greater than zero or greater than a certain threshold value.
- the number of users K is three here and the number of PIC levels following level zero is three here.
- Level 0 represents a set of K single-user receivers.
- the received signal is detected by a RAKE receiver for each user l..k..K.
- the RAKE receiver for a user contains a plurality of correctors (fingers) for the user-specific codes.
- the signals from the RAKE fingers are combined into a symbol using a combination method. This symbol is evaluated with a decision function, so that the symbol hypothesis for level 0 arises. This symbol hypothesis is evaluated directly after this stage with a suitable decision function, eg the hard delimiter.
- This symbol hypothesis of the symbol n for the user k after the level 0 is denoted by d k [n].
- the output signal d k represents the symbol hypothesis for the following PIC stage or the end symbol that can be evaluated with a decision function.
- PIC parallel interference reduction
- Level 0 is a conventional single user correlation receiver (e.g. RAKE), as in Fig. 1.
- Level 1 consists of a conventional level for parallel interference reduction, e.g. can be carried out by a broadband or narrowband method according to FIG. 2. From the second PIC level, the PIC levels are modified in such a way that no interference or symbol calculations need to be carried out if the same input data has already been created in a previous PIC level.
- FIG. 3 serves to illustrate this variant.
- the symbols for the symbol number [n] of all users K at the exit of stage (i-1) are compared with those of stage (i-2). If these are identical, or if their difference is smaller than a certain barrier that determines the accuracy of the interference calculation, no interference calculation and reduction is carried out for this symbol number in stage (i). If these are not identical, all possible effects on the previous [n-1, ...] and subsequent [n + 1, ...] symbols of all users K must be calculated in this stage.
- the number of symbol numbers to be taken into account results from the relevant length of the channel impulse response. If this is shorter than the symbol duration, for example, the effect on the previous and the following symbol of all users must be taken into account. An exemplary embodiment of this is shown in FIG. 3.
- step (i) only one symbol of a user, here symbol 5 of the user 2, changes from stage (i-2) to stage (i) for an exemplary symbol sequence section
- step (i) only the interference contributions of this user to the symbol numbers 4,5 and 6 of all other users have to be calculated. This can be done, for example, by adding this interference difference to the interference calculated in the previous stage.
- Variant III is explained with reference to FIGS. 4 and 5.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Noise Elimination (AREA)
- Time-Division Multiplex Systems (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10026615 | 2000-05-19 | ||
DE10026615A DE10026615B4 (de) | 2000-05-19 | 2000-05-19 | Verfahren und Anordnung zum Empfang von CDMA-Signalen |
PCT/DE2001/001898 WO2001089107A1 (de) | 2000-05-19 | 2001-05-18 | Verfahren und anordnung zum mehrstufigen parallelen interferenzunterdrückung in einem cdma-system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1410521A1 true EP1410521A1 (de) | 2004-04-21 |
EP1410521B1 EP1410521B1 (de) | 2007-10-31 |
Family
ID=7643986
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01944948A Expired - Lifetime EP1410521B1 (de) | 2000-05-19 | 2001-05-18 | Verfahren und anordnung zur mehrstufigen parallelen interferenzunterdrückung in einem cdma-system |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1410521B1 (de) |
AT (1) | ATE377295T1 (de) |
AU (1) | AU2001267314A1 (de) |
DE (2) | DE10026615B4 (de) |
WO (1) | WO2001089107A1 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101013615B1 (ko) | 2002-04-12 | 2011-02-10 | 톰슨 라이센싱 | 제어 회로 |
CN100373836C (zh) * | 2002-05-30 | 2008-03-05 | 华为技术有限公司 | 一种并行干扰对消方法及其装置 |
US7876810B2 (en) | 2005-04-07 | 2011-01-25 | Rambus Inc. | Soft weighted interference cancellation for CDMA systems |
US7808937B2 (en) | 2005-04-07 | 2010-10-05 | Rambus, Inc. | Variable interference cancellation technology for CDMA systems |
US7715508B2 (en) | 2005-11-15 | 2010-05-11 | Tensorcomm, Incorporated | Iterative interference cancellation using mixed feedback weights and stabilizing step sizes |
US7826516B2 (en) | 2005-11-15 | 2010-11-02 | Rambus Inc. | Iterative interference canceller for wireless multiple-access systems with multiple receive antennas |
WO2006131522A1 (de) | 2005-06-10 | 2006-12-14 | Siemens Aktiengesellschaft | Vorrichtung und verfahren zur diagnose und/oder behandlung funktioneller gastrointestinaler erkrankungen |
WO2007038016A2 (en) * | 2005-09-23 | 2007-04-05 | Tensorcomm, Inc. | An iterative interference canceller for wireless multiple-access systems with multiple receive antennas |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5151919A (en) * | 1990-12-17 | 1992-09-29 | Ericsson-Ge Mobile Communications Holding Inc. | Cdma subtractive demodulation |
US5553062A (en) * | 1993-04-22 | 1996-09-03 | Interdigital Communication Corporation | Spread spectrum CDMA interference canceler system and method |
GB9317604D0 (en) * | 1993-08-24 | 1993-10-06 | Philips Electronics Uk Ltd | Receiver for ds-cdma signals |
DE4329317A1 (de) * | 1993-08-31 | 1995-03-02 | Siemens Ag | Verfahren und System zum Übertragen von Nachrichten |
US5506861A (en) * | 1993-11-22 | 1996-04-09 | Ericsson Ge Mobile Comminications Inc. | System and method for joint demodulation of CDMA signals |
US5784368A (en) * | 1994-09-23 | 1998-07-21 | Motorola, Inc. | Method and apparatus for providing a synchronous communication environment |
US5644592A (en) * | 1995-04-24 | 1997-07-01 | California Institute Of Technology | Parallel interference cancellation for CDMA applications |
US5872776A (en) * | 1995-11-22 | 1999-02-16 | Yang; Lin-Lang | Signal detection and interference cancellation based on simplified matrix inversion for CDMA applications |
DE19616828C2 (de) * | 1996-04-26 | 1999-02-25 | Siemens Ag | Verfahren zur Separierung eines empfangenen Signalgemisches |
DE19630391C1 (de) * | 1996-07-26 | 1997-07-24 | Siemens Ag | Verfahren zur empfangsseitigen Datendetektion in einem Übertragungssystem |
JP3311943B2 (ja) * | 1996-10-18 | 2002-08-05 | 松下電器産業株式会社 | 干渉信号除去装置 |
JP3390900B2 (ja) * | 1996-12-20 | 2003-03-31 | 富士通株式会社 | 干渉キャンセラ及び仮判定方法 |
WO1999009674A2 (en) * | 1997-08-13 | 1999-02-25 | Qualcomm Incorporated | Method and apparatus for interference cancellation for a high data rate user in a cdma system |
JP3778397B2 (ja) * | 1997-12-27 | 2006-05-24 | ソニー株式会社 | 送信方法、送信電力制御方法及び基地局装置 |
DE19826036C2 (de) * | 1998-06-12 | 2000-05-25 | Bosch Gmbh Robert | Verfahren zur Trennung von mehreren überlagerten codierten Nutzersignalen |
-
2000
- 2000-05-19 DE DE10026615A patent/DE10026615B4/de not_active Expired - Fee Related
-
2001
- 2001-05-18 AT AT01944948T patent/ATE377295T1/de not_active IP Right Cessation
- 2001-05-18 WO PCT/DE2001/001898 patent/WO2001089107A1/de active IP Right Grant
- 2001-05-18 AU AU2001267314A patent/AU2001267314A1/en not_active Abandoned
- 2001-05-18 EP EP01944948A patent/EP1410521B1/de not_active Expired - Lifetime
- 2001-05-18 DE DE50113207T patent/DE50113207D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0189107A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE50113207D1 (de) | 2007-12-13 |
WO2001089107A1 (de) | 2001-11-22 |
AU2001267314A1 (en) | 2001-11-26 |
ATE377295T1 (de) | 2007-11-15 |
DE10026615B4 (de) | 2004-12-23 |
DE10026615A1 (de) | 2001-12-13 |
EP1410521B1 (de) | 2007-10-31 |
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